// Created by zyq on 2025/2/27.
#include "iostream"

using namespace std;

int main() {
    // 整型(整数)
    21;
    // 实型(小数)
    1.9;
    // 字符, 单个字符
    'q';
    // 字符串
    "Hello World";

    cout << 21 << endl;
    cout << 1.0 << endl;
    cout << "q" << endl;
    cout << "hhhh" << endl;


    return 0;
}

